Would it be possible, and practical, to use a kind of script that would allow Tree Control like expansion and contraction of the signatures? Using the word Tree is a bad example, because it'd only be one node (the sig itself).

Users viewing the forum could have options in their CP to set the default of the sigs (expanded, contracted, (as networkerror suggests) expanded once per author per page).

In addition, it might be possible to track the size of the sig client side using the script, and if it's too long, truncate it with ellipsis with the option to fully expand it.

I'm just throwing that out there. It may be too complex for what it's worth, I'm not sure how flexible the forums are, or what's possible (web programming is not my thing).

The poll options are kind of... eh.
I don't care if the sig updates past posts or not, but I do care about having them. Some of them have relatively useful links or info... or they're good for a laugh. I agree that it shows a bit of personality per user. So maybe an option to just not view the ones that annoy you would be well and fine.

Im agreeng with ckknight there.It must be up to the poster.And it should b up 2 the viewer to c them or not,the signatures. Personally i have no problem with signatures. It often says something about the person behind the signature,but limits are to be prefered.And now over to something completly different.